Honda Civic. Manual — part 930

Fig. 3: Identifying Keyless/Power Door Locks/Security System Component
Location (3 Of 3)

SYSTEM DESCRIPTION

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

SECURITY ALARM SYSTEM

The security alarm system is armed automatically after the doors, hood, and trunk
are closed and locked. For the system to arm, the ignition switch must be off, the
key must be removed from the ignition switch, and the MICU must receive signals
that the doors, hood, and trunk are closed and locked. The alarm can be disarmed at
any time by unlocking the driver's door with the key or pressing the UNLOCK
button on the transmitter.

When everything is closed and locked, the only inputs that are grounded, and have
0 V, are the driver's door lock knob switch (LOCK position), and the audio unit or
navigation unit (if equipped). In other words, all of the other switches are open, and
have about 10 to 12 V, including the key cylinder switches. The security indicator
in the gauge control module (speedo) begins to flash immediately after the vehicle
is completely closed and locked, and 15 seconds later, the security system arms. If
the security indicator does not flash, the system is not arming. A beep sounds and
the parking lights flash to confirm the security alarm system is armed if the LOCK
button is pressed a second time within 5 seconds.

If one of the switches is misadjusted or shorted internally, or there is a short in the
circuit, the security system will not arm. As long as the control unit continues to
receive a ground signal (0 V), it senses that the vehicle is not closed and locked, and
the system will not arm. A switch that is slightly misadjusted can cause the alarm to
sound for no apparent reason. In this case, a significant change in outside air
temperature, the vibration of a passing truck, or someone bumping into the vehicle
could cause the alarm to sound. There is no glass breakage or motion detector
feature.

If anything is opened or improperly unlocked after the system is armed, the control
unit receives a ground signal from that switch, and the 10 to 12 V reference drops to
0 V. If the audio unit or navigation unit (if equipped) is disconnected, the input
loses its ground, and the input voltage goes to 10 to 12 V. The system sounds the
alarm when any of these occur:

A door or the trunk is forced open.

NOTE:

This applies to USA LX, EX and Si models.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

A door is unlocked without using the key or the transmitter.

The hood is opened.

The audio unit or navigation unit (if equipped) is disconnected.

The transmitter PANIC button is pressed.

When the system sounds the alarm, the horn sounds and the exterior lights flash for
2 minutes. The alarm can be stopped at any time by unlocking the driver's door with
the key or by pressing any button on the transmitter.

PANIC MODE

The panic mode sounds the alarm in order to attract attention. When the PANIC
button on the transmitter is pressed and held for 2 seconds, the horn sounds and the
exterior lights flash for about 20 seconds.

The panic mode can be cancelled at anytime by pressing any button on the
transmitter or by turning the ignition switch ON (II). The panic mode will not
function if the ignition switch is ON (II).

KEYLESS ENTRY SYSTEM

The keyless entry system is integrated with the multiplex integrated control system.
The multiplex integrated control unit (MICU) receives LOCK, UNLOCK and
PANIC signals from the immobilizer-keyless control unit (keyless receiver).

The keyless entry system allows you to lock and unlock the vehicle with the
transmitter. When you press the LOCK button, all doors lock. When you press the
UNLOCK button once, only the driver's door unlocks. The other doors will unlock
when you press the button a second time. The doors will not lock with the
transmitter if a door is not fully closed, or if the key is in the ignition switch.

When the switch for the ceiling light is in the center (DOOR) position, it will come
on when the UNLOCK button is pressed. If a door is not opened, the light will go
off in about 30 seconds, and the doors will relock. If the doors are locked with the
transmitter within 30 seconds, the light will go off immediately.

CIRCUIT DIAGRAM

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

Fig. 4: Keyless/Power Door Locks/Security System - Circuit Diagram (1 Of 4)

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)